<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 开发环境版本 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

</head>
<body>
    <div id="app">
        {{ message }}
      </div>
      <script>
        var app = new Vue({
            el: '#app',
            data: {
                message: 'Hello Vue!'
            }
            })
    </script>
</body>
</html>